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全部科目 > 水路交通运输技能考试 > 海船船员考试 > 船舶管理(轮机专业) > 轮机英语 > 船舶电气与船舶安全

单项选择题

The separate supplies are connected in either star or delta formationThe star formation is most commonly used and requires（） slip-rings on the alternator.

A.two
B.three
C.four
D.five

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单项选择题

After a ship enters service it is（） for the main bus-bar to be made dead.

A.usually
B.commonly
C.exceptional
D.unavoidably

单项选择题

（） is a machine by which electrical energy is transformed into mechanical energy.

A.An alternator
B.An electric motor
C.A diesel engine
D.A main switchboard

单项选择题

（） shall be continuously powered and shall have an automatic changeover to a stand by power supply in case of loss of normal power supply.

A.Cooling system
B.Alarm system
C.The air conditioning installation
D.The mooring equipment

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